Edit: Infinite file size.
Proof: I converted the 62 minute long 5 Centimeters Per Second movie into a .wav and saved it. Combined with the HD Skydome and the ground, it is... Unknown MB using default Alice A2W zip compression. The .WAV file itself is 97MB. Unfortunately it took over an hour for the sound file alone to save before Alice crashed due to a rendering error. I would have estimated the A2W file to be ~100MB. I would also have noted that outside of Alice, the packaging time would have taken less than 5 minutes.